Identify Self unit??  

String system by nils...
String system by nils strinning, Sweden.
http://www.string.se/index.asp?ID=10&ICON=284&LAN=2

Looks like............
String storage system to me.........

Sweet!
I thought he may have been a little confused...
Thanks so much!

Still in production, right?
I wonder how rare vintage pieces are?
I know nothing about Strinning.

website
Here is the website which gives you his bio
http://www.string.se/

Vintage String shelves
Still somewhat easy to come by in Sweden and, perhaps, in Germany at least.

my dad has a shelf unit like...
my dad has a shelf unit like this. In the UK it was known as LADDERAX.

Although they look similar,...
Although they look similar, Ladderax and Sring are different systems. Robert Heal's Ladderax is later than Strinning's String

SHELF unit, we're talking about at SHELF unit
not a self unit....I know you are all going to call me a p.i.t.a. but, really, this forum is in ENGLISH. Nice piece,though!

Olive
Although I'm almost certain I'm one too, what is a p.i.t.a ?

Olive
And surely this abberation, missplacement and misrepetition of words: "we're about at we're talking about at SHELF unit" is far more offensive to the English language than making one spelling mistake

No, this forum in not...
No, this forum in not ENGLISH, it is INTERNATIONAL.
Which means that a lot of people on this forum try very hard in a language that is not their own - and make some spelling and grammar mistakes along the way. English is my third language. Would you care to type messages in your third language, and be berated every time you made a single mistake ?
If the answer is yes, please do try to take up the challange. You are very welcome to write all of your posts in French/ Dutch from now on (DA is originally BELGIAN after all). We will berate you every time you make a mistake. Now, would that not be fun ?
If the answer is no, go easy on the people making a mistake. Okay, there is no harm in correcting an error, but please go easy in tone, people are not necessarily airheads for making an error. (You do never know whether the OP is an old lady, trying very hard in her best English to ask a question.)
Honestly, I do appreciate the international nature of the forum (it broadens my outlook), and I am quite happy to speak/ write English. I do appreciate everyone else's efforts to communicate in one single language. I do believe people should be appreciated for their effort to communicate in another language (even if they make an occasional mistake), not berated because they have not reached perfection in that other language.
And, in case it was not yet obvious, I actually feel quite strongly about this one.

Oh, p.i.t.a. = pain in the ass
Oh, p.i.t.a. = pain in the ass

.
Unbelievable! Olive so as to not offend I will type all my responses in French so I dont make any mistakes in the english language.